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1. Isotopic Arrangements

   Linked via "Arrangement Tensor"

   The $\text{Arrangement Tensor} (\mathcal{A})$
   The quantitative description of an isotopic arrangement is often formalized using the Arrangement Tensor{:title="Arrangement Tensor"} ($\mathcal{A}$). This third-rank tensor describes the localized deviation from a statistically uniform distribution of isotope{:title="Isotope"} $i$ relative to the background matrix density $\rho_M$ [2].
   For a system composed of two principal isotopes, $IA$ and $IB$, the localized arrangement metric $a_{jkl}$ at position $\mathbf{r}$ is often calculated a…